Ohio

Rainwater and Land Development: Ohio's Standards for Stormwater Management, Land Development and Urban Stream Protection

StateOhiohighNo

Open source PDF ↗Official agency page ↗

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Document Metadata

Jurisdiction level

state

“This book defines Ohio's standards and specifications for stormwater practices implemented during land development.”
Abstract

State

Ohio

“Ohio Department of Natural Resources Division of Soil and Water Conservation Columbus, Ohio 43229-6605”
Title Page

Version / edition

Third Edition 2006

“Third Edition 2006”
Title Page

Adoption / effective date

2006-12-01

“Date: December 2006”
Title Page

Last revised date

Not found in document

No evidence cited

Relationship to state manual

independent

“This book defines Ohio's standards and specifications for stormwater practices implemented during land development.”
Abstract

Design Criteria

Design storm return periods (years)

1-year, 2-year, 5-year, 10-year, 25-year, 50-year, 100-year

“Storm Event Return Interval (years) 2 5 10 25 50 100 ... 1-year 2-year 5-year 10-year 25-year 50-year 100-year”
Chapter 1, Table 1.1.2; Bioretention Design Checklist

Water quality volume method

Water quality volume (WQv) is the volume of runoff treated in a water quality pond, calculated as WQv (ac-ft) = C × 0.75 × A / 12 (Equation 1, adapted from ASCE/WEF Urban Runoff Quality Management), where C is the runoff coefficient from site imperviousness (Equation 2: C = 0.858i² – 0.78i + 0.773i + 0.04, with i = percent imperviousness / 100) and A is drainage area in acres—equivalent to treating runoff from 0.75 inch of precipitation. Ohio EPA NPDES permit requires 20% additional WQv capacity for sediment accumulation; extended detention volume equals WQv and is drawn down over 24–48 hours.

“The water quality volume (WQv) is the volume of runoff that is treated in a water quality pond. WQv (ac-ft) = C * 0.75 * A / 12 ... C = 0.858i² – 0.78i + 0.773i + 0.04 ... the Ohio EPA NPDES stormwater general permit for construction activities requires that the water quality volume be increased by 20% for capacity lost over time due to sediment accumulation.”
Chapter 2, Section 2.6

Peak flow calculation method(s)

NRCS Technical Release 55 (TR 55), USGS empirical equations for small urban streams in Ohio (Sherwood 1986), Manning's Equation

“NRCS Technical Release 55 (TR 55) or other suitable method shall be used to determine ... peak discharges were estimated using empirical equations developed by the U.S. Geological Survey (Sherwood, 1986)”
Chapter 4; Chapter 1, Table 1.1.2

Required hydrologic/hydraulic software

Not found in document

No evidence cited

Approved BMP categories

Reduction of Impervious Areas, Low Impact Development, Conservation Development, Wetland Setback, Stream Setback Area, Water Quality Ponds, Infiltration Trench, Sand & Organic Filter, Grass Filter, Bioretention Area, Grassed Swale, Level Spreader, Rock Lined Channel, Rock Outlet Protection, Diversion, Terrace, Subsurface Drainage

“2.6 Water Quality Ponds; 2.7 Infiltration Trench; 2.8 Sand & Organic Filter; 2.9 Grass Filter; 3.0 Bioretention Area; 2.1 Reduction of Impervious Areas; 2.2 Low Impact Development; 2.3 Conservation Development”
Chapter 2 Table of Contents